/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.table.functions.python.utils;

import org.apache.flink.annotation.Internal;
import org.apache.flink.configuration.ReadableConfig;
import org.apache.flink.table.functions.python.PythonFunction;

import java.lang.reflect.InvocationTargetException;

/**
 * Utilities for creating PythonFunction from the fully qualified name of a Python function.
 */
@Internal
public enum PythonFunctionUtils {
	;

	public static PythonFunction getPythonFunction(String fullyQualifiedName, ReadableConfig config) {
		try {
			Class pythonFunctionFactory = Class.forName(
				"org.apache.flink.client.python.PythonFunctionFactory",
				true,
				Thread.currentThread().getContextClassLoader());
			return (PythonFunction) pythonFunctionFactory.getMethod(
				"getPythonFunction",
				String.class,
				ReadableConfig.class)
				.invoke(null, fullyQualifiedName, config);
		} catch (IllegalAccessException | ClassNotFoundException | NoSuchMethodException |
			InvocationTargetException e) {
			throw new IllegalStateException(
				String.format(
					"Instantiating python function '%s' failed.", fullyQualifiedName), e);
		}
	}
}
